/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

export class PageStatic {
  /**
   * "a:b" -> "a"
   * "a:b:c" -> "a:b"
   * "a" -> null
   * null -> null
   * "a:b::sub-component" -> "a"
   * "a::sub-component:b" -> "a::sub-component" // should currently not happen in Tobago
   *
   * @param clientId The clientId of a component.
   * @return The clientId of the naming container.
   */
  static getNamingContainerId(clientId: string): string {
    if (clientId == null || clientId.lastIndexOf(":") === -1) {
      return null;
    }

    const strings = Array.from(clientId);
    for (let i = strings.length - 2; i > 0; i--) {
      if (strings[i - 1] !== ":" && strings[i] === ":" && strings[i + 1] !== ":") {
        return clientId.substring(0, i);
      }
    }
    return null;
  }
}
